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You can measure the distances and angles from the surface normal!
Figure 1. High-resolution 3D model of our heterodyne-detected second harmonic generation (HD-SHG) spectrometer. All distances, angles, and dimensions in this CAD model are true to the actual experimental setup. Each optical component accurately represents the real elements used in our instrument, as described and validated in our publication:
Journal of the American Chemical Society 2025, 147 (17), 14308–14315.
If you use or adapt this design, please cite the above paper to acknowledge the source of the instrument model.
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Amani O. Alghamdi 
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